/*
 *  Copyright (c) 2001-2007, Jean Tessier
 *  All rights reserved.
 *  
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  
 *      * Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *  
 *      * Redistributions in binary form must reproduce the above copyright
 *        notice, this list of conditions and the following disclaimer in the
 *        documentation and/or other materials provided with the distribution.
 *  
 *      * Neither the name of Jean Tessier nor the names of his contributors
 *        may be used to endorse or promote products derived from this software
 *        without specific prior written permission.
 *  
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jeantessier.classreader;

import java.io.*;
import java.util.*;

public class DirectoryExplorer {
    private Collection<File> files = new LinkedList<File>();

    public DirectoryExplorer(String[] filenames) throws IOException {
        for (String filename : filenames) {
            explore(new File(filename));
        }
    }

    public DirectoryExplorer(Collection<String> filenames) throws IOException {
        for (String filename : filenames) {
            explore(new File(filename));
        }
    }

    public DirectoryExplorer(String filename) throws IOException {
        this(new File(filename));
    }

    public DirectoryExplorer(File file) throws IOException {
        explore(file);
    }

    private void explore(File file) throws IOException {
        if (file.exists()) {
            files.add(file);
            
            if (file.isDirectory()) {
                exploreDirectory(file);
            }
        }
    }

    private void exploreDirectory(File dir) throws IOException {
        String[] entries = dir.list();
        for (int i=0; i<entries.length; i++) {
            explore(new File(dir, entries[i]));
        }
    }

    public Collection<File> getFiles() {
        return files;
    }
}
